Cutter-head.



F. 0. WELLS.

CUTTER HEAD.

APPLICATION I'IL'BD MAB-{24, 1906.

Patented Jan.25, 1910.

designates the .lel t5 the axis.

" E .-STATES i:

rim-ma o. WELLS, or enzennrrann, MASSACHUSETTS, AssIeNon tro warns:Business OGMPANY, OF GREENFIELR MASSACHUSETTS, CTORZBORATION"Curran-HEAD.

To all whom it may concern:

l le it known that 1,. FRANK 0. WELLs, a citlzen of the United States ofAn1erica,'re-.

, siding at Greenfield,in the county ofFranlt-' lin and State of'Massachusetts, have invented new and useful Improvements in Cut-"tor-Heads, of which the following is a speci: fication. V

This invention relates to'cutters and more.

particularly to means for securing the cutters to the cutter-head. v

vBroadly, the invention-consists in one of "its forms in providingawedge havingtwo curved surfaces for locking the cutter in radial groovesin the cutter-head,one of wish to he understood to include cutters ofall kinds, as milling cutters, taps, or

reamers. I

Referring to the drawings forming part of this applicatiorn-Figure 1 isan end elevation of' the cutter-head showing the radial grooves therein.Fig. 2 is a plan View ofthe cutter-head showing the shank andlongitudinal grooves therein for receiving the cu-ttenbars and wedges.side and and elevation of one of the cutterblades, Fig. l-is an'endelevation of the cutter-head showing :the cutter-blades and securingwedges in place. Fig. 5 isa side and end elevation of the securingWedge. Fig. 6 is a section on line 6-'6, Fig. 2.

Referring to these drawings in detail, a shank of the cutter, b thecutter-head,and c the radial and longitudinal grooves cut in the head b.V These grooves have two plane surfacesrl and e at right angles to eachother for receiving the flat 'surfailiisof the cutters, and arrangedparal- The surface Z of the groove "opposite the surface (Z15 a curvedseini-c1rcular one and slightly inclined, as indicated by the twoconcentric lines 9 and h. This surface may be described as that of aconc. w The cutters 2' have two surfaces, j and I at right anglesto eachother and are adapted to engage the shoulders or plane surfaces (Z and erespectively, as shown in Figs. and i 1 6, the Width of the surfacebeing greater 1 than that of the surface d so that the cutterSpecification of Letters Patent. Q Patented- Applicationfil'erl March24, 1906., seriel Naaoaase.

radius of the c the line 0', andsf 5 e center at the point'wh re. theline 0 intersects the line g g t For the purpose of securely lockin [thef "slipping out radially of the at, the point a,

Fig. 3 is a' n the groove 0, and the' Wedg {securely locked in placeihthefgrooi e,

@- and n are v rm 7 4 1 projects beyond the periphery ofrthe cutterheadas I shown at m' when in place; 'f

.The forward; or cutting surfaceiv'v lo fQthe-i cutters isformed aCurved surfacenthex .t'ifittiur being-indi ate b cutteri into the slots0 of the cutter} sad,

I have found that by .employin'g 'a'wedgegm shaped piece havingtwocurved st rface" e having/the same radius ofcurv'at'reia e cutting iface n of the cutters, and, thewotl ler being struck from a center-0fless rad u the cutters are prevented from workingiloose aridt 70 theparts are assembled and n of'the cutter 11 While the surface If isformed? on a'shorter'ra'dius, as in'dicatedf by a 4, thecenter of thecurved". surfactant being;

and on line parallel with the. line 32 but located short.distance backiof the line? and toward the c'enter of jtlie' jcutter b, as indicatedat. w; The parallel lines p and w are perpendicular-to thesurf-flItjwilltjb:

is laced" 315:

a be Lit face or face at ofthe grooved apparent that after the cutterin, against the same,. tlttat the cutter:

heingunderstood of course-that the surfacjes cutter from working out 'oft'he'groove radi ally. by reason of the fact thatthe surface-t of thewedge engages-the overhanging port-ion ofthe cutter hcad while thecurved surfaces n and s will also prcvcnt any radial relatlvei to themovement of the cutter z' wedge '1'. The wedge or plug impartsatransverse pressure of the inclinedcurved surface ofthe rooves 'c and adownward pressuretowardt is con? 10 ter of the cutter-head as well, thussecurely lockingthe parts in place.

Itwill' be apparentthat by reaso11;-o'ftlie I wedge r having two curvedsurfaces-rs and t of different radii, and the rcentersiofithesd Jail.25, 1910. y

re'ovesi when riven; together; Referring to Figs 415, and dofthedraW 1'ingspthis ivedgeis indicated byr. TheT'surface a is ofthe samecurvaturewas 'tlie' surface pl ed eren i liei ar 9' curved surfacet'ofthe wedgepr :enga sthe on the cutter by'reason radius as the curvedsurface s of the wedge) will have a tendency to cause the cutter 2' toand w in Fig. 4 of the drawings simply represent the distance thecenters of the two curves at and t are from each other Therefore thereisalways a constant tend- 'reason'of the. location of the centers of"center of the larger curve and will always maintain the cutter firmlyseated against the rangement of the wedge and cutter, and

s, as measured along a line parallel tothe the lines of resultant forcesexerted by the curves being in lines perpendicular to the l to faced andparallel with each other, that the l action of the wedge r on the cutteri,- (which has a curved surface of the same move radially separating theperpendiculars p and'w until the cutter i rests firmly on the bottom ofthe groove. In other words there will be a relative lateral motion ofthe curved surfaces n" and s when assembling the wedge and cutter, Thecenter lines 3) measured on the surface of the vwall d.

ency to lock the cutter 2' in the party Z) by curvature o'f'the conicalsurface 25 of the Wedge and the curved surface a of the cutter, the samebeing laterally spaced from each other in the cutter-head Z), with thecenter of the smaller curve inward of the surfaces (Z and e of theradial grooves 0.

By reason of theconstruction and arsincethe center of the curved surface25 is at. one, side of the center of the curvedsurface wall Cl and in adirection toward the wall 6,

wedging action passing through the center of the smaller curve will fallwithin or at one side of the lines of resultant forces passingthroughthecenter of the larger curve, whereby the cutter is securely locked by thewedge r to'the cutter-head.

Having thus described my invention, what I claim and desire to secure byLetters Patent of the United States, is

l. A cutter-head having a slot therein, the slot having two .fiatsurfaces at right angles each other and parallel with the axis of thecutter, a surface of the slot opposite one of the flat surfaces beingconical, a cutter located in the slot and having two flat surfacesengagin the rectangular surfaces of the slot and a so a curved surfacemerging 'into the cutting edge and facing the conical surface of theslot, a wedge or key retaining the cutter in the head, said key having aconical surface engaging the conical surface of the cutter-head, and acurved surface corresponding in curvature with the curved surface of thecutter.

2. As an improvement in means for se curing cutters in cutter-headsincluding a radial slot in the head formed with a conical surface andtwo flat surfaces, the conical sur face producing an over-hanging lip,the cutter having a curved surface merging into a cutting edge andprotruding beyond the periphery of the cutter-head, and locking meansengaging the curved surface of the cutter and the conical surface. asdescribed.

3. In a cutter, a body having a groove, provided with a side wall havingits face curved in cross-section, a cutter-blade seated in the groovehaving a face curved in crosssection opposed to the eurved face of theFRANK O. WELLS.

Witnesses:

CHARLES N. S'ronmnn, VINNIE M. FARR.

